Machine for cutting rubber sealing-rings for jars, &amp;c.



No. 648,602.- Patented ma 1, I900.

.1. E. THBUPP, 1R. MACI'HN'E FOR UUTTING RUBBER SEALING RlNGS FDR JARS.8m.

.(Application flle'd Oct. 25, 1899.) D "0 91 2 Shaets-Sheet l.

THE NORRXS PETERS co. Puorouruoq wunmm'ou, n. c.

No. 648,602. Patented ma I, I900.

.1. E. THROPP, JR. MACHINE FOR. GUTTING BUBBER SEALING RINGS. FOR JARS,&c.

(Appl ica tion filed ocuaa', 1899.)

2 SheetsSheet 2.

(No Model.)

Nrrnn STATES JOHN E. THROPP, JR, OF TRENTON, NEIV JERSEY.

MACHINE FOR CUTTING RUBBER SEALING-RINGS FOR JARS, 84,0.

SPECIFICATION forming part of Letters Patent No. 648,602, dated May 1,1900.

Application filed October 25, I899. Serial NO- 734,774- (No model- Toall whom, it may concern.-

Be it known that I, J OHN E. THROPP, Jr. a citizen of the United States,residing at Trenton, in the county of Mercer and State of New Jersey,have invented certain new and useful Improvements in Machines forCutting Rubber Sealing-Bin gs for Jars and the Like; and I do herebydeclare the following to be a full, clear, and exact description of thesame, reference being'had to the accompanying drawings, forming a partof this specification, and to the letters of reference marked thereon.

This invention relates to improvements in machines for cutting rubberrings such as are ordinarily employed for sealing jars and similarvessels, and more particularly to that class of machines wherein therings are cut from a soft-rubber tube or sleeve mounted between suitablecenters and rotated at a high rate of speed.

The invention has for its object to improve Referring to theaccompanying drawings,

Figure 1 is a perspective View looking at the front of a machineembodying my present improvements, the mandrel and rubber tube, togetherwith the driving-belts, being omitted. Fig. 2 is a vertical sectionlooking toward the right and showing the carriage in elevation. In saiddrawings the letter A indicates a bed having Ways a thereon and adaptedfor the reception of head and tail stocks B and C, respectively. Thespindle b of the head-stock is driven from a suitable counter-shaft by abelt passing around a pulley b or by other suitable driving-gear, and itis adapted to rotate a mandrel upon which the rubber tube or sleeve fromwhich the rings are cut is mounted. The center 0 of the tail-stock C isadjusted longitudinally by means of a hand wheel 0, and the tail-stock,if desired, may be adjustable longitudinally of the bed, these partsbeing preferably similar to corresponding parts of an ordinaryturning-lathe, and therefore need not be further described.

Mounted on the ways a so as to slide longitudinally of the bed is acarriage D, having I an apron d for supporting the feeding andcontrolling mechanism to be hereinafter described. Upon its uppersurface the carriage is provided with transverse ways d, upon which ismounted the supplemental carriage E, adapted to support the tool post orholder E. A suitable tool for cooperating with the rubber tube or sleeveis mounted in the toolholder, being held by the screw 6, and in theoperation of the machine the supplemental carriage and tool are movedinwardly to sever a ring, then drawn out, and while drawn out the maincarriage is moved longitudinally of the bed a distance suflicient toequal the thickness of the rings desired to be cut, when the tool isagain advanced to make another out. These motions are preferablyaccomplished automatically, and the invention in the present caseresides mainly in the mechanism employed therefor.

Referring to Fig. 1, it will be seen that on the front of the bed A andextending parallel therewith is a long cam F, mounted in bearings f ateach end of the bed and adapted to be rotated from a counter-shaft by abelt passing around a pulley f on the end of the cam-shaft. The rotationof the'cam is preferably slow as compared with the rotation of thespindle and work, and its movement is utilized to both advance andretract the tool, as well as to advance the carriage between cuts. Onthe front of the main carriage D a bracket or bearing G is formed, inwhich is journaled a bell-crank lever H, one arm of which extendsupwardly and is pivotally connected by means of a link I with thetoolholder or supplemental carriage E, while its other arm isbifurcated, and the two branches h embrace the cam F, whereby the saidlever is oscillated as the cam rotates and imparts a reciprocatorymovement to the tool-holder and supplemental carriage. Wear-plates h arepreferably provided on the'inner faces of the arms h, and screws k maybe employed for adjusting the plates to take up'wear due to the frictionof the cama'gainst said plates. The cam being of uniform diameterthroughout,the carriage may be moved back and forth without obstructionand without varying the throw of the tool, and in order to feed thecarriage the desired distancebetween each advance or cut made by thetool a rack K is provided on the front of the bed A, and meshingtherewith is a pinion 70, carried by the rear end of a shaft journaledin the apron d and extending through to the front of said apron, whereit is provided with a ratchetwheel L. Immediately behind theratchetwheel L and journaled on the said shaft or on an axis coincidentwith said ratchet-wheel is a pawl-carrier M, one end of which ispreferably weighted and provided with a spring N for holding that end ofthe carrier down and the opposite end up, while its opposite end isprovided with a projection orblock 0, adapted to contact with the underside of the cam F. The pawl-carrier M is provided with a pawl P, one arm19 of which cooperates with theratchet-wheel L to advance theratchetwheel each time the pawl-carrier is oscillated or the pawldepressed. The pawl is held in engagement with the ratchet wheel by aspring 19' under normal circumstances; but in order to disengage thepawl from said wheel, so as to permit the carriage to be shiftedlongitudinally of the bed by hand, the pawl is provided with areleasing-arm 19 which may be moved by hand, but is more particularlyadapted to contact with a fixed stop Q on the apron whenever the pawl isdepressed a sufficient distance, and the pawlcarrier is provided with ahandle or projection R, by means of which it may be moved so as todisengage the pawl from the ratchetwheel. The handle will also serve asa ready means for moving the carriage while holding the pawl disengaged.Furthermore, at the left-hand end of the bed there is provided anincline S, up which the left-hand end of the pawl-carrier is adapted toride when the carriage is moved toward the left. Thus the incline willalso cause the pawl-carrier to move asu'lficient distance to disengagethe pawl from the ratchet-wheel and so automatically arrest the advancemovement of the carriage when it approaches theend of the bed.

In order to provide for cutting thick or thin rings, the ratchetteeth onthe ratchet wheel L are preferably made relatively fine, and theprojection O, which contacts with the cam for oscillating thepawl-carrier, is made adj ustable toward and from the center ofoscillation, so as to give the pawl-carrier any desired throw. Thisadjustment is secured by extending the right-hand arm of the pawlcarrierhorizontally and mounting the projection O in a guide thereon,preferably aslotguide 0, where it is held by means of a setscrew 0. Withthis arrangement by moving the projection 0 toward or from the center ofoscillation of the pawl-carrier the range of movement of theratchet-wheel, and consequent feed imparted to the carriage, may beadjusted with the utmost nicety, and as a result rings may be cut ofexactly the desired thickness.

To prevent any possible racing or overthrow of the ratchet-wheel, afriction-brake, consisting of a spring-shoe T, is provided adapted tobear against a friction-drum 25, formed on the rear side of theratchet-wheel. The tension of the spring-shoe is determined bya setscrewT, passing down through a hub T journaled in a projection U on theapron. The hub T is provided with a handle 75 and it, together with theprojection U, is provided with relatively-steep cooperating inclines,which when the hub is turned by the handle in one direction will raisethe springshoe quickly into contact with the frictiondrum; but in caseit is desired to shift the carriage by hand the friction-brake may be asquickly and easily released by turning the handle in the oppositedirection.

In operation it is obvious that the attendant having placed a mandrelcarrying'a rubber sleeve or tube in position and having shifted thecarriage to the right-hand end of 'the bed may start the machine inoperation,

when the carriage will be automatically fed and the rings severed fromthe tube or sleeve in succession until the left-hand end of the bed isapproached, when the carriage-feeding mechanism is automatically trippedand the carriage brought to rest. Should for any reason it be desired toshift the carriage at any time in its operation or in shifting it backto the starting-place, it is only necessary for the attendant to swingthe handle]! around and grasping the handle R depress the pawlcarrierand draw the carriage back. Obviously the tool may be projected more orless to operate upon larger or smaller tubes or sleeves of rubber, andthis, in connection with the adjustment for feed, renders the devicepractically universally adjustable with respect to the work to beperformed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is-

I. In a machine for cutting rubber rings, the combination with the bed,rotary workholder and carriage movable longitudinally on the bed, of arack-bar, and pinion mounted on the bed and carriage respectively,aratchetwheel connected with said pinion, a pawl cooperating with saidratchet-wheel, a pawlcarrier mounted on the carriage, a relativelylongcam journaled on the bed and cooperating with said pawl-carrier at anypoint in its length for rotating the ratchet-wheel to feed the carriage,a tool-holder, and independent connections between the tool-holder andcam for moving the holder transversely on the carriage; substantially asdescribed.

2. In a tool-feeding mechanism for rubberring-cutting machines, thecombination with the bed and a relatively-long cam journaled on said bedand arranged parallel therewith,

of a carriage sliding on-said bed, a transversely-movable tool-holdermounted on the carriage, independent connections cooperating with thecam for moving the tool-holder transversely, a rack-bar on the bed, apinion meshing with said rack-bar and journaled on the carriage, aratchetwheel, connected with said pinion, a pawl-carrier and aprojection on the pawl-carrier cooperating with the cam for moving thecarriage transversely; substantially as described.

3. In a carriage-feeding mechanism for rubber-ring-cutting machines, thecombination with a bed, a relatively-long cam journaled on said bedparallel therewith and a fixed rack-bar parallel with the cam, of acarriage, a pinion journaled on the carriage and meshing with therack-bar, a ratchet-wheel connected with said pinion, a pawl cooperatingwith the ratchet-wheel, a pawl-carrier and an adjustable projection onsaid pawl-carrier for cooperating with the cam; substantially asdescribed.

4. In a carriage-feedin g mechanism for rubber-cutting machines, thecombination with the bed, cam, rack-bar, and carriage mounted to movelongitudinally on the bed, of a pinion meshing with the rack-bar, aratchetwheel, a pawl-carrier adapted to be oscillated by the cam, a pawlmounted on said carrier and adapted to cooperate with the ratchetwheel,a releasing-arm on said pawl and a fixed stop with which said armscooperate when the pawl-carrier is given an abnormal throw;substantially as described.

5. Inacarriage-feeding mechanism forrubber-ring-cutting machines, thecombination with a bed, work-holder, cam, rack-bar, and carriage mountedto move longitudinally on the bed, of the pinion journaled on thecarriage and meshing with the rack-bar, the ratchet-wheel, pawl-carrierjournaled on an axis coincident with the ratchet-wheel, the pawljournaled on the pawl-carrier, the spring for holding said pawl inposition to engage the ratchet-wheel, the releasing-arm on said pawl,the fixed stop with which said arm cooperates when the pawl-carrier isgiven an abnormal throw and a fixed incline with which the pawl-carriercooperates to release the pawl; substantially as described.

6. In a carriage-feedin g mechanism for rubber-ring-cutting machines,the combination with the bed, work-holder, cam, rack-bar, and carriagemounted to move longitudinally on the bed, of the pinion journaled onthe carriage and meshing with the rack-bar, the ratchet-wheel connectedwith the pinion, the pawl-carrier moved bythe cam, the pawl 3' ournaledon said carrier, and having the releasing-arm, the fixed stop with whichsaid arm contacts when the pawl-carrier is given an abnormal throw, aspring for holding said pawl-carrier against such movement and a fixedincline on the bed for moving the pawlcarrier against the tension of itsspring and releasing the pawl 5 substantially as described.

7. In afeedingmechanism forthe carriages of rubber-ring-cuttingmachines, the combination with the bed, the rotarywork-holder, the cam,the rack-bar,and the carriage mounted to move longitudinally on the bed,of the pinion journaled on the carriage, and meshing with the rack-bar,the ratchet-wheel connected with the pinion, the pawl-carrier journaledon the carriage and having one of its arms extended parallel with thecam, an adjustable projection mounted on said arm and adapted tocooperate with the cam and a pawl carried by said pawl-carrier forcooperation with the ratchet-wheel; substantially as described. I

8. Inacarriage-feeding mechanism forrubber-ring-cutting machines, thecombination with the bed, the rotary work-holder, the can], the rack-barand the carriage mounted to move longitudinally on the bed, of thepinion journaled on the carriage and meshing with the rack-bar, theratchet-wheel connected with the pinion, the friction-drum on theratchet-wheel, the pawl-carrier, the pawl, the throw-out stop forreleasing said pawl when the carrier is given an abnormal throw, thefriction-brake cooperating with the drum and a quick release for saidfriction-brake embodying a rotary hub and cooperating relatively-steepinclines, whereby when said hub is rotated, the friction-brake will bethrown into and out of engagement with the drum; substantially asdescribed.

JOHN E. THROPP, J R.

Witnesses:

LEWIS O. MOCLURG, CHAS. H. ENGLISH.

